Indicator-card scaling-rule.



L. A` KRUEGER. INDICATOR CARD scAuNG RULE.

APPLICAYION FILED JUNE I7. 1915.

@www/m L. A. KRUEGER.

mmcAToR CARD scALlNG RULE.

APPLICATION mso :un: l1. 1915.

Patented Feb. 13,1917.

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' To all whom 'it may concern:

UNITED sTATEs PATENT OFFICE.

LEWIS A. KRUEGER, OF MASON CITY, IOWA.

INDICATOR-CARD SCALING-RULE.

Application led June 17 Be it known that I, LEWIS A. KRUEGER, a citizenof the United States, residing at Mason City, in the county of CerroGordo, State of Iowa, have invented certain new and useful Improvementsin Indicator-'Card Scaling-Rules; and I do hereby declare the followingto be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it appertains to make anduse the same.

This invention relates to an indicator card scaling rule.

An object of the invention resides in the provision of a rule by meansof which an indicator card of a steam cylinder may be /read to find themean effective pressure.

A further object of the invention resides in so constructing the devicethat as the scale is moved from one ordinate to the other 0n theindicator card the readings will be computed.

With these and other objects in view, such as will appear as thedescription progresses, my invention comprises the combination andarrangement of parts as set forth in and falling within the scope of theappended claim. v

Referring to the drawing:

Figure 1 is a plan view of the device constructed in accordance with.the invention with the slide removed showing the characters thereon.

Fig. 2 is a similar view of a portion of the device with the slide inplace. Fig. 3 is a section on line 3 8 of Fig. 2,- the section beingtaken through the slide.

Fig. 4 is a detail of the slide. l

Fig. 5 is a ragmental sectional view, taken through the slide.

Fig. 6 is an enlarged detail of a portion of the body of the device,showing the divisional marks thereon.

Fig. 7 is a fragmental detail showing the device applied to an indicatorcard, the slide being in the position it will occupy previous to themovement across the irst ordinate.

Fig. 8 is a similar view showing the slide in the position it willoccupy previous to its movement across the second ordinate.

Referring to the drawing wherein like parts are indicated by likecharacters throughout the several views z- In the embodiment of myinvention shown in the drawing, I have illustrated a scale Specificationof Letters Patent.

Patented Feb. 13, 1917.

1915. Seria1No.34,686.

which consists of an elongated body portion I which is wedge-shaped incross section and has a slide Z mounted thereon, which slide consists ofa frame 3 having a pair ot downwardly extending Hanges 4 which extendinto grooves 5 in the edges of the body portion l so that the slide maybe moved upon the body portion. Secured to the inner face of one ot'these flanges 4 is a spring 6 which bears upon the edge of the bodyportion 1. The glass has a hair line S thereon extending transversely ofthe body portion 1 and in alinement with the apex ot a point 9 formed onthe other of the ilangcs 4.

One edge of the body portion lY is livided into an inch scale by theline l0, which inch Scale is in turn divided into fractions of an inch.Ipreferably sixty-fourths. The remainder of the body portion is set-ofi'into divisions by horizontal lilies 1l. The divisions being indicated bythe characters l2 to 18 inclusive. Each of these divisions is divided bymeans of vertical lines 19 into scales, there being two scales in eachdirision. At the end of each scale in each division is a character 20which indicates the scale of spring used on the indicator. The verticallines 19 in each of the divisions are designated by two horizontal rowsof charactors 21 and Q2, the former row beingr located above the latter,which characters form the scale above referred to. These characters 21and indicate the length of the ordinates of the indicator cardmultiplied by the scale of spring and the hundredths are placed on oneside of the vertical lines 19, while the tens and units are placed onthe other side for convenience of reading. The spaces between thevertical lines 19' are divided into smaller subdivisions, as illustratedin the drawing, for convenience of reading, the number of subdivisionsbeing equal to the difference between the number on one of the vertical.lines in each of the divisions and the number on the next adpicent line.For instance in the division 1S at the upper left hand corner of thebody portion the number of marks between the sub-divisions 1l50`and 1200will be 50.

In Fig. 7 of the drawing I have illustrated the device as being used intaking the reading from an indicator card when an eighty scale of springhas been used and I have therefore only illustrated the eighty scale forthe sake of convenience. The device is put in place as illustrated inthis ligure with the edge of the body portion 1 parallel to the firstordinate and the line 23 inthe same horizontal plane as the point 24Where the 'iirst ordinate intersects the steam line. At

held in this position and the device moved to the next ordinate wherethe point 9 on` the slide is brought into alinement with the point ofintersection between the second ordinate and the steam line. Theoperation of the slide previously described is then repeated and thisoperation is continued until the slide has been passed across all of theordinates. When this has been done the 'slide will have been moved tosuch position that the hair line alines with one of the vertical lines19 or one of the sub-divisions therebetween. l,Suppose for instance italines `with the line 19 at which line the character 640 of the series21 appears. It will be noted that the hundredths are on one side of thevertical line and the tens and units on the other side. This Willproduce a reading, thus themean effective pressure in this particularcase Will be 64.0.

It will be noted from the drawing that when certain scales of spring areused the slide will be moved from the left to the right of the bodyportion of the device and when others are used it will be moved from theright to left. This arrangement is followed for the sake of convenience.

It will thus be seen that I have provided a device by means of which themean effective pressure may be readily found, which device will obviatethe necessity for computing the said mean effective pressure, the stepsin the computation being automatically performed by the movement of theslide upon the body portion of the device.

l/Vhile I havev illustrated and described a particular embodiment of myinvention, I have merely done so for the sake of convenience and I donot wish to be limited to that particular embodiment as it is obviousthat numerous changes may be made within the details of constructionthereof without in any way departing from the spirit of the in ventionor exceeding the scope of the appended claim.

What I claim is:--

In an indicator card scaling rule, the combination with a body portionhaving a plurality of scales thereon, ofa slide adapted to be moved onthe body portion for a dis-- tance equal to the combined lengths of theordinates of an indicator card and to cooperate with certain of the saidscales to produce the reading of the mean effective pressures, saidslide having a hair line arrangedto travel over the scales as the scalemoves' and being provided adjacent the underside of the body With apointer having its apex in vertical alinement with said hair line.

In testimony whereof, I aiiX my signature, in the presence of twoWitnesses.

LEWIS A. KRUEGER.

Witnesses: r

E. W. CLARK, C. C. BRUNNER.

